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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]        
Beginning balance     $ 19,571  
Other comprehensive income (loss) before reclassifications     (8,364)  
Amounts reclassified from accumulated other comprehensive income     (3,986)  
Total other comprehensive income (loss), net of tax (10,541) 4,969 (12,350) 3,506
Ending balance 7,221   7,221  
Unrealized Gains on Available-for-Sale Securities [Member]
       
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]        
Beginning balance     19,663  
Other comprehensive income (loss) before reclassifications     (8,456)  
Amounts reclassified from accumulated other comprehensive income     (3,986)  
Total other comprehensive income (loss), net of tax     (12,442)  
Ending balance 7,221   7,221  
Derivative Financial Instrument [Member]
       
Changes in balances of each component of accumulated other comprehensive income, net of taxes [Roll Forward]        
Beginning balance     (92)  
Other comprehensive income (loss) before reclassifications     92  
Amounts reclassified from accumulated other comprehensive income     0  
Total other comprehensive income (loss), net of tax     92  
Ending balance $ 0   $ 0